Author Question: While examining the spectrum of a galaxy, you find all the hydrogen lines are shifted to longer ... (Read 81 times)

amal · **on:** Jul 27, 2018

While examining the spectrum of a galaxy, you find all the hydrogen lines are shifted to longer wavelengths. This galaxy is

A) moving away from us.
B) moving towards us.
C) not forming new stars.
D) expanding explosively.
E) blueshifted.

Question 2

What was most surprising about SN1987A?

A) Its pulsar appeared within weeks of the explosion.
B) The supernova was luminous enough to see with the naked eye.
C) The supernova was not even in our own Galaxy.
D) The parent star was a blue supergiant, much like Deneb or Rigel.
E) It did not produce the flood of neutrinos our models had led us to expect.